Electric equipment and battery thereof

Abstract

The utility model discloses a battery and electric equipment, the battery comprises a single battery and a heat exchange piece, the single battery comprises a shell and an electrode assembly arranged in the shell, the electrode assembly comprises a plurality of electrode plates which are stacked along a first direction, at least two positive plates of the plurality of electrode plates are arranged discontinuously, and at least two negative plates of the plurality of electrode plates are arranged discontinuously. The shell comprises a first side wall perpendicular to the extension direction of the electrode assembly, the heat exchange piece is in heat conduction contact with the first side wall, a temperature adjusting medium is introduced into the heat exchange piece to adjust the temperature of the single battery, and a heat conducting medium is arranged between the electrode assembly and the first side wall. The thermal resistance between the electrode assembly and the shell of the battery disclosed by the utility model is small, and the overall heat dissipation capability and the cooling effect of the single battery are good.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and specifically, to a battery and an electrical equipment. Background Art

[0002] In recent years, with the popularization of new energy vehicles, as the power source of new energy vehicles, power batteries have also developed rapidly. In order to ensure the safety and stability of power battery use, power batteries need to be cooled and dissipated heat by means of heat exchange components, etc. However, in the actual use process, there are still problems with poor cooling effect in power batteries. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to a certain extent.

[0004] To this end, an embodiment of the utility model provides a battery, which has a small thermal resistance between the electrode assembly and the housing, and the overall heat dissipation capacity and cooling effect of the single battery are good.

[0005] An embodiment of the utility model also provides an electrical equipment including the above battery.

[0006] The battery of the embodiment of the utility model includes a single battery and a heat exchange component;

[0007] The single battery includes a housing and an electrode assembly arranged in the housing. The electrode assembly includes a plurality of electrode sheets stacked along a first direction, and at least two of the plurality of electrode sheets are non - continuously arranged;

[0008] The housing includes a first side wall perpendicular to the extension direction of the electrode assembly. The heat exchange component is in thermal contact with the first side wall. A flow channel is provided in the heat exchange component for introducing a temperature - regulating medium to regulate the temperature of the single battery, and a heat - conducting medium is provided between the electrode assembly and the first side wall.

[0009] In some embodiments, the thermal conductivity of the heat - conducting medium is greater than the thermal conductivity between the electrode assembly and the side wall of the housing other than the first side wall.

[0010] In some embodiments, the thermal conductivity of the electrode assembly in the first direction is k1, the thermal conductivity of the electrode assembly in a second direction perpendicular to the first direction is k2, k2>k1, the second direction is parallel to the electrode sheet, and the first side wall is perpendicular to the second direction.

[0011] In some embodiments, the thermal conductivity of the electrode assembly in a third direction is k3, k2≈k3, and the third direction is perpendicular to the first direction and the second direction.

[0012] In some embodiments, the thermal conductivity of the thermal conductive medium is k4, the distance between the electrode assembly and the first side wall is L1, the area of the first side wall is A1, and L1 / (k4*A1) ≤ 9.9 K / W.

[0013] In some embodiments, the housing includes a second side wall disposed opposite to the electrode plate in the first direction. The thermal resistance R1 between the electrode assembly and the first side wall is not greater than the thermal resistance R2 between the electrode assembly and the second side wall. The housing has a third side wall perpendicular to the first side wall and the second side wall, and the thermal resistance R1 is not greater than the thermal resistance R3 between the electrode assembly and the third side wall.

[0014] In some embodiments, there are multiple monomer cells. The gap width between the second side walls of two adjacent monomer cells is L2, the capacity of the monomer cell is Q1, and 17.2 Ah / mm ≤ Q1 / L2 ≤ 547.3 Ah / mm.

[0015] In some embodiments, a plurality of medium channels for the flow of the temperature regulating medium are provided in the heat exchanger. The cross-sectional area of the medium channel is S2, and the cross-sectional area of the heat exchanger perpendicular to the extending direction of the heat exchanger is S3, and 50% ≤ S2 / S3 ≤ 99%.

[0016] In some embodiments, a chamfer R1 is provided between two adjacent channel walls of each medium channel, and 0.1 mm ≤ R1 ≤ 5 mm;

[0017] And / or, the maximum voltage of the battery is U1, the insulation voltage of the heat exchanger is U3, and U3 ≥ 7.5U1;

[0018] And / or, a plurality of spacer ribs are provided in the heat exchanger, and the plurality of medium channels are separated by the plurality of spacer ribs;

[0019] And / or, the first-order free mode of the battery ≥ 55 Hz.

[0020] The electrical device according to an embodiment of the present invention includes the battery as described in any one of the above embodiments.

[0021] Beneficial effects: The electrical device and its battery according to the embodiment of the present invention are provided with a thermal conductive medium between the electrode assembly of the battery and the housing, so that the thermal resistance between the electrode assembly and the housing is small, and the overall heat dissipation capacity and cooling effect of the monomer cell are good. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an exploded schematic view of the monomer cell and the heat exchanger according to the embodiment of the present invention.

[0023] Figure 2It is a schematic cross-sectional view of a single battery according to an embodiment of the present invention and at the A-A position.

[0024] Figure 3 is Figure 2 a perspective view of the single battery in the first direction in

[0025] Figure 4 is Figure 2 a perspective view of the single battery in the third direction in

[0026] Figure 5 an exploded view of a plurality of single batteries and a heat exchange member according to an embodiment of the present invention.

[0027] Figure 6 is an exploded view of the housing of the battery according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1 - single battery; 11 - housing; 111 - first side wall; 112 - second side wall; 113 - third side wall; 12 - electrode terminal; 13 - electrode assembly; 131 - electrode plate; 132 - separator; 14 - heat transfer medium;

[0030] 2 - heat exchange member;

[0031] 3 - pipeline;

[0032] 4 - housing; 41 - top cover; 42 - bottom case;

[0033] 5 - potting medium. Detailed implementation manners

[0034] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0035] As Figure 1 shown, the battery according to an embodiment of the present invention includes a single battery 1 and a heat exchange member 2. Among them, the single battery 1 can be a square battery. Figure 1 The first direction in

[0036] can be the width direction of the single battery 1, the second direction can be the height direction of the single battery 1, and the third direction can be the length direction of the single battery 1.

[0037] For example, as Figure 2As shown, the housing 11 can be in the shape of a square shell. The electrode assembly 13 is disposed inside the housing 11. The electrode assembly 13 can be processed by a stacking process. The multiple electrode sheets 131 of the electrode assembly 13 can include multiple positive electrode sheets and multiple negative electrode sheets. The multiple positive electrode sheets and the multiple negative electrode sheets can be arranged alternately one by one in the first direction.

[0038] It should be noted that since the multiple electrode sheets 131 of the electrode assembly 13 are processed by a stacking method, compared with the winding forming process, any two positive electrode sheets of the electrode assembly 13 in this embodiment are discontinuously designed, that is, there is no direct connection between adjacent two positive electrode sheets.

[0039] As Figure 2 shown, the electrode assembly 13 can further include a separator 132. The separator 132 can be bent back and forth in the first direction. The electrode sheet 131 can be disposed between two overlapping parts of the separator 132 in the first direction.

[0040] The housing 11 includes a first side wall 111 perpendicular to the extending direction of the electrode assembly 13. The heat exchanger 2 is in thermally conductive contact with the first side wall 111. A flow channel is provided in the heat exchanger 2 for introducing a temperature regulating medium to regulate the temperature of the single cell 1. And a heat conductive medium 14 is provided between the electrode assembly 13 and the first side wall 111.

[0041] For example, as Figure 3 shown, the extending direction of the electrode assembly 13 can be the third direction. The first side wall 111 of the housing 11 is the shell side wall disposed opposite to the electrode assembly 13 in the third direction. There can be two first side walls 111. The electrode assembly 13 can be located between the two first side walls 111 in the third direction. And a certain gap can be reserved between each first side wall 111 and the electrode assembly 13. The heat conductive medium 14 can be made of materials such as heat conductive structural adhesive. The heat conductive medium 14 can be filled in the gaps reserved between each first side wall 111 and the electrode assembly 13.

[0042] It should be noted that when there are more electrode sheets 131 of the electrode assembly 13 arranged, at this time, the extending direction of the electrode assembly 13 can also be the first direction. The first side wall 111 can also be arranged opposite to the electrode assembly 13 in the first direction.

[0043] As Figure 1 shown, a heat exchanger 2 can be provided on the outer surface of each first side wall 111. The heat exchanger 2 can be a liquid cooling plate. The heat exchanger 2 can be in fitting contact with the first side wall 111. A temperature regulating medium can be circulated through the heat exchange medium. The temperature regulating medium can be a liquid such as water.

[0044] During use, the heat generated by the electrode assembly 13 can be conducted to each first sidewall 111 via the heat-conducting medium 14, and then the rapid cooling of the first sidewall 111 can be achieved through the heat exchange between the first sidewall 111 and the heat exchanger 2, thereby regulating the operating temperature of the battery. It should be noted that when the battery operates at a low temperature, the temperature-regulating medium can also conduct heat from the first sidewall 111 and the heat-conducting medium 14 to the electrode assembly 13, so as to ensure that the battery always operates within a suitable ambient temperature range.

[0045] In the battery according to the embodiment of the present invention, a heat-conducting medium 14 is provided between the first sidewall 111 and the electrode assembly 13, so that the thermal resistance between the electrode assembly 13 and the housing 11 can be reduced, the thermal conductivity between the electrode assembly 13 and the wall of the housing 11 is improved, and thus the overall heat dissipation capacity and cooling effect of the single battery 1 are improved.

[0046] Secondly, the heat-conducting medium 14 also has a certain elasticity, so that it can buffer the extrusion and vibration between the housing 11 and the electrode assembly 13.

[0047] In some embodiments, the thermal conductivity of the heat-conducting medium 14 is greater than the thermal conductivity between the electrode assembly 13 and the sidewalls of the housing 11 other than the first sidewall 111. For example, the housing 11 can be in the shape of a square shell, and the housing 11 can have a total of 6 sidewalls, of which there are two first sidewalls 111, and the two first sidewalls 111 are arranged opposite to each other in the third direction. There can be only a gap or a clearance between the remaining sidewalls arranged opposite to each other in the first direction or the second direction and the electrode assembly 13.

[0048] The thermal conductivity of the heat-conducting medium 14 is much greater than the thermal conductivity at the vacant gap or clearance. Thus, the first sidewall 111 can form the optimal heat dissipation surface of the single battery 1, which can facilitate the cooling design of the side of the single battery 1 and also improve the overall cooling efficiency.

[0049] In some embodiments, as Figure 4 shown, the thermal conductivity of the electrode assembly 13 in the first direction is k1, as Figure 3 shown, the thermal conductivity of the electrode assembly 13 in the second direction perpendicular to the first direction is k2, k2 > k1, the second direction is parallel to the electrode plate 131, and the first sidewall 111 is perpendicular to the second direction. Since the thermal conductivity in the second direction is low, thus, along the second direction, the heat generated by the electrode assembly 13 can be quickly conducted to the first sidewall 111, further improving the heat exchange efficiency.

[0050] In some embodiments, the thermal conductivity of the electrode assembly 13 in the third direction is k3, k2≈k3, and the third direction is perpendicular to the first direction and the second direction. Specifically, for the stacked electrode assembly 13, the thermal conductivity of the electrode assembly 13 in each of the length, height, and width directions is anisotropic. Among them, in the extension direction of the electrode sheet 131, k2≈k3, but either of the thermal conductivity k2 and the thermal conductivity k3 is greater than k1. At this time, the first side wall 111 can be provided on the side of the electrode assembly 13 in the second direction or the third direction, so as to fully ensure good heat dissipation characteristics between the first side wall 111 and the electrode assembly 13.

[0051] In some embodiments, the thermal conductivity of the heat-conducting medium 14 is k4. After the material of the heat-conducting medium 14 is determined, the thermal conductivity k4 of the heat-conducting medium 14 is also the thermal conductivity of the corresponding material.

[0052] As Figure 3 shown, the distance between the electrode assembly 13 and the first side wall 111 is L1, and the distance L1 is also the width of the reserved gap between the electrode assembly 13 and the first side wall 111. The area of the first side wall 111 is A1, and the area A1 is the projected area of the first side wall 111 in the third direction, and L1 / (k4*A1) ≤ 9.9 K / W.

[0053] By limiting the thermal conductivity k4, the area A1 of the first side wall 111, and the distance L1 within the range defined by the above inequality, an optimized design of the thermal conductivity k1, the area A1 of the first side wall 111, and the distance L1 can be achieved. Furthermore, the situation where the heat dissipation effect is poor due to the first side wall 111 and the electrode assembly 13 being too far apart or the thermal conductivity being insufficient can be avoided. That is, if L1 / (k1*A1) > 9.9 K / W, it will affect the side heat dissipation effect of the single battery 11, and thus the usage requirement that the maximum temperature of the battery is < 55°C under the condition of normal temperature fast charging cannot be met.

[0054] In some embodiments, as Figure 3 and Figure 4 shown, the housing 11 includes a second side wall 112 disposed opposite to the electrode sheet 131 in the first direction. The thermal resistance R1 between the electrode assembly 13 and the first side wall 111 is not greater than the thermal resistance R2 between the electrode assembly 13 and the second side wall 112. The housing 11 has a third side wall 113 perpendicular to the first side wall 111 and the second side wall 112, and the thermal resistance R1 is not greater than the thermal resistance R3 between the electrode assembly 13 and the third side wall 113 of the housing 11.

[0055] Thus, relative to the large surface and the bottom surface, where the large surface can be the second side wall 112 described above and the bottom surface can be the third side wall 113 described above, the thermal resistance between the electrode assembly 13 and the first side wall 111 of the housing 11 is minimized, thereby fully ensuring a good cooling and heat dissipation effect through a side wall with a relatively small area.

[0056] In some embodiments, there are multiple single cells 1. For example, as Figure 5 shown, the multiple single cells 1 can be arranged in a matrix as a whole, and the multiple single cells 1 can be arranged in columns along the first direction and in rows along the third direction. Each column can include multiple single cells 1 arranged at intervals along the first direction, and each row can include multiple single cells 1 arranged at intervals along the third direction.

[0057] As Figure 5 shown, the gap width between the second side walls 112 of two adjacent single cells 1 is L2, the capacity of the single cell 1 is Q1, and 17.2 Ah / mm ≤ Q1 / L2 ≤ 547.3 Ah / mm.

[0058] If Q1 / L2 < 17.2 Ah / mm, at this time, the interval size between the single cells 1 will be relatively large, resulting in a low volume utilization rate of the overall battery, unable to meet the design requirement of the battery pack volume utilization rate ≥ 70%, and secondly, the volume energy density of the single cell 1 is also low.

[0059] If Q1 / L2 > 547.3 Ah / mm, at this time, the interval size between the single cells 1 will be relatively small. When a single single cell 1 triggers a thermal runaway, it is easy to trigger the thermal runaway of the adjacent single cells 1, and then trigger a range of thermal runaways of the single cells 1 in the entire battery, reducing the safety of battery use. The battery pack catches fire and explodes. The battery thermal runaway standard and test method can refer to GB 38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles", as shown in Table 1 specifically.

[0060] Table 1: Battery Thermal Runaway Standard and Volume Utilization Rate Table

[0061]

[0062]

[0063] In some embodiments, the heat exchanger 2 is provided with a plurality of medium channels for the circulation of the temperature control medium. The cross-sectional area of the medium channel is S2, and the cross-sectional area S2 is also the flow cross-sectional area of each medium channel. The cross-sectional area of the heat exchanger 2 perpendicular to the extension direction of the heat exchanger 2 is S3, and the cross-sectional area S3 can be regarded as the cross-sectional area of the heat exchanger 2 in the cross-section orthogonal to the first direction, and 50% ≤ S2 / S3 ≤ 99%.

[0064] If S2 / S3 < 50%, at this time, the effective heat dissipation cross-sectional area of the medium channel of the heat exchanger 2 is relatively low, which will cause insufficient heat dissipation capacity, and the cooling capacity and cooling rate of the single battery 1 cannot meet the requirements of thermal management. As a result, the maximum temperature of the single battery 1 under the normal temperature fast charging condition will exceed 55°C, which cannot meet the corresponding usage requirements.

[0065] If S2 / S3 > 99%, at this time, the wall thickness of the heat exchanger 2 will be too thin, the structural strength of the heat exchanger 2 will decrease, and the manufacturing process of the heat exchanger 2 will become a manufacturing bottleneck. Under the vibration and shock conditions, the heat exchanger 2 is prone to breakage, cracking, deformation, etc. The vibration and shock conditions of the heat exchanger 2 can refer to the test standard GB38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles", as shown in Table 2 below. The capacity of the battery in Table 2 is 185Ah, the power is 97kWh, and the number of battery cells and the series-parallel relationship are 1P208S.

[0066] Table 2: Vibration and Shock Test Table of Heat Exchanger

[0067]

[0068] In some embodiments, a chamfer R1 is provided between adjacent two channel walls of each medium channel, and 0.1mm ≤ R1 ≤ 5mm. Thus, the flow resistance of fluids such as the temperature control medium in the medium channel can be reduced, and the overall heat exchange efficiency and heat exchange effect can be improved.

[0069] In some embodiments, the maximum voltage of the battery is U1, and the maximum voltage U1 can be regarded as the output voltage of the battery. The insulation voltage of the heat exchanger 2 is U3. Insulating materials can be pasted or sprayed on the surface of the heat exchanger 2, or the heat exchanger 2 can be processed from non-metallic composite materials, so that the surface of the heat exchanger 2 has insulating properties. The insulation voltage U3 is also the voltage value representing the insulating characteristics of the heat exchanger 2, and U3 ≥ 7.5U1.

[0070] If U3 < 7.5U1, at this time, the insulation ability of the heat exchanger 2 will be relatively low. Under special conditions, such as when the single battery 1 touches thermal runaway, insulation failure may occur between the heat exchanger 2 and the single battery 1, which will lead to electrical safety risks such as short circuits and arcing in the battery, and trigger a larger range of thermal runaway.

[0071] In some embodiments, a plurality of spaced ribs are provided in the heat exchanger 2, and a plurality of medium channels are separated and formed by the plurality of spaced ribs. For example, the spaced ribs can be partitions provided in the heat exchanger 2, and the spaced ribs can be arranged at equal intervals along the second direction. The above-mentioned medium channels can be formed between two spaced ribs, thus ensuring the independence of each medium channel.

[0072] In some embodiments, the battery can be filled with a potting medium 5, and the potting medium 5 can be a potting structural adhesive. After the potting medium 5 is cured, the first-order free mode of the battery is ≥55 Hz. Thus, it can be ensured that the battery will not have problems such as structural failure under various mechanical conditions, such as random vibration, shock, etc., and the stability of use and performance is guaranteed.

[0073] Specifically, due to the low thermal conductivity of the potting structural adhesive, the heat transferred from the single battery 1 to other single batteries 1 or other components through the potting structural adhesive can be blocked, achieving a good heat insulation effect, which is beneficial to suppressing the spread of thermal runaway of a single battery 1.

[0074] Since the potting medium 5 has a certain elasticity, the potting medium 5 can be adaptively compressed along with the deformation of the single battery 1 after long-term use, thereby providing space for the deformation of the single battery 1 and playing a role in absorbing the expansion displacement of the single battery 1 under different working conditions.

[0075] Secondly, the setting of the potting medium 5 can also ensure good fitting between the potting medium 5 and the single battery 1 and other structural components when the single battery 1 breathes and expands under different working conditions; even when the single battery 1 rebounds after expansion, the potting medium 5 can still ensure good fitting between it and the single battery 1 and other structural components, ensuring the compactness of the overall structure.

[0076] In addition, compared with the existing filling of foams, etc., the potting medium can be directly potted, avoiding the complex process of bonding the foam to the single battery, simplifying the overall assembly process, and improving the assembly efficiency. Compared with filling foams, the bonding and fitting effect between the potting medium and the single battery is better, thus fully ensuring the structural compactness of the single battery assembly.

[0077] In some embodiments, as Figure 5 shown, there are multiple heat exchange members 2, each heat exchange member 2 can be in the shape of a long plate, each heat exchange member 2 extends along the first direction, and the multiple heat exchange members 2 are arranged at intervals in the third direction.

[0078] As Figure 5 shown, pipelines 3 can be provided on the same side of the multiple heat exchange members 2 along the first direction. There are two pipelines 3, and the two pipelines 3 are respectively a liquid inlet pipe and a liquid discharge pipe. The liquid inlet pipe and the liquid discharge pipe are each connected to the heat exchange member 2. Through the liquid inlet pipe, a temperature control medium can be introduced into the multiple heat exchange members 2, and then the temperature control medium in the multiple heat exchange members 2 can be discharged through the liquid discharge pipe, so as to realize the circulating transportation of the temperature control medium in the multiple heat exchange members 2.

[0079] In some embodiments, the battery includes a housing 4, and multiple single batteries 1 are all assembled in the housing 4. For example, as Figure 6As shown, the housing 4 may include a bottom case 42 and a top cover 41. The bottom case 42 may be in the shape of a square box with an open top. The top cover 41 may be fixed to the top side of the bottom case 42 by fasteners to seal the open top. A plurality of single cells 1 may be arranged in a matrix and may all be assembled within the bottom case 42.

[0080] In some embodiments, the single cell 1 further includes an electrode terminal 12, and the electrode terminal 12 is disposed on the side wall of the housing 11 along the second direction or the third direction. For example, as Figure 2 shown, a tab may be led out from the electrode plate 131, and the tab can be regarded as the electrode terminal 12. The second direction may be the up-down direction, and the third direction may be the front-back direction. The electrode terminal 12 may be disposed on the top side or the bottom side of the single cell 1. In some other embodiments, the electrode terminal 12 may also be disposed on the front side or the rear side of the single cell 1.

[0081] Thereby, the electrode terminal 12 is generally located within the extended plane of the electrode plate 131, which facilitates the leading out of the electrode terminal 12 and also avoids the situation of bending the electrode terminal 12.

[0082] The electrical equipment of the embodiments of the present invention will be described below.

[0083] The electrical equipment of the embodiments of the present invention includes a battery, and the battery may be the battery described in any of the above embodiments. The electrical equipment may be a vehicle such as a sedan or an SUV, and of course, it may also be other electrical equipment that needs to install a battery.

[0084] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A battery, characterized in that: Including single battery and heat exchanger; The single battery comprises a shell and an electrode assembly disposed in the shell, wherein the electrode assembly comprises a plurality of electrode sheets stacked and arranged along a first direction, and at least two positive electrode sheets of the plurality of electrode sheets are disposed discontinuously; The shell includes a first side wall perpendicular to the extension direction of the electrode assembly, the heat exchange element is in thermal contact with the first side wall, a flow channel is provided in the heat exchange element for passing a temperature regulating medium to adjust the temperature of the single battery, and a heat conductive medium is provided between the electrode assembly and the first side wall.

2. The battery according to claim 1, characterized in that The thermal conductivity of the heat-conducting medium is greater than the thermal conductivity between the electrode assembly and a side wall of the housing other than the first side wall.

3. The battery according to claim 1, characterized in that The thermal conductivity of the electrode assembly in the first direction is k1, and the thermal conductivity of the electrode assembly in a second direction perpendicular to the first direction is k2, k2>k1, the second direction is parallel to the electrode sheet, and the first side wall is perpendicular to the second direction.

4. The battery according to claim 3, characterized in that The thermal conductivity of the electrode assembly in a third direction is k3, k2≈k3, and the third direction is perpendicular to the first direction and the second direction.

5. The battery according to any one of claims 1 to 4, characterized in that: The thermal conductivity of the heat-conducting medium is k4, the distance between the electrode assembly and the first side wall is L1, the area of ​​the first side wall is A1, and L1 / (k4*A1)≤9.9K / W.

6. The battery according to any one of claims 1 to 4, characterized in that: The shell includes a second side wall arranged opposite to the electrode sheet in the first direction, the thermal resistance R1 between the electrode assembly and the first side wall is not greater than the thermal resistance R2 between the electrode assembly and the second side wall, and the shell has a third side wall perpendicular to the first side wall and the second side wall, and the thermal resistance R1 is not greater than the thermal resistance R3 between the electrode assembly and the third side wall.

7. The battery according to claim 6, characterized in that There are a plurality of single cells, the width of the gap between the second side walls of two adjacent single cells is L2, the capacity of the single cell is Q1, and 17.2Ah / mm≤Q1 / L2≤547.3Ah / mm.

8. The battery according to any one of claims 1 to 7, characterized in that The heat exchanger is provided with a plurality of medium channels for circulating the temperature regulating medium, the cross-sectional area of ​​the medium channels is S2, the cross-sectional area of ​​the heat exchanger perpendicular to the extension direction of the heat exchanger is S3, and 50%≤S2 / S3≤99%.

9. The battery according to claim 8, characterized in that A chamfer R1 is provided between two adjacent channel walls of each medium channel, and 0.1 mm ≤ R1 ≤ 5 mm; And / or, the maximum voltage of the battery is U1, the insulation voltage of the heat exchange element is U3, and U3 ≥ 7.5U1; And / or, the first-order free mode of the battery is ≥55 Hz.

10. An electrical device, characterized in that: The invention comprises a battery as claimed in any one of claims 1 to 9.

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